"""
Copyright (c) 2022 Huawei Technologies Co.,Ltd.

openGauss is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:

          http://license.coscl.org.cn/MulanPSL2

THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details.
"""
"""
Case Type   : DMS分布式锁
Case Name   : 数据库获取锁、解锁、锁冲突操作
Create At   : 2023/4/21
Owner       : opentestcase033
Description :
    1.创建数据库
    2.开启事务a，重命名数据库名称，不提交，事务b执行后提交
    3.开启事务b，修改数据库所属表空间为pg_default
    4.清理环境
Expect:
    1.设置成功
    2.执行成功，获取锁
    3.等锁释放，事务a提交(解锁)，事务b执行失败
    4.成功
History     :
"""

import os
import time
import unittest

from testcase.utils.Logger import Logger
from testcase.utils.Common import Common
from testcase.utils.CommonSH import CommonSH
from testcase.utils.Constant import Constant
from testcase.utils.ComThread import ComThread


class DmsOck(unittest.TestCase):

    def setUp(self):
        self.log = Logger()
        self.log.info(f'-----{os.path.basename(__file__)} start-----')
        self.pri_sh = CommonSH('PrimaryDbUser')
        self.constant = Constant()
        self.db_name = 'db_dms_ock_0014'

    def test_dms_ock(self):
        text1 = '-----step1:创建数据库;expect:成功-----'
        self.log.info(text1)
        create_db = f"drop database if exists {self.db_name};" \
                    f"create database {self.db_name} template template0;"
        create_db_res = self.pri_sh.execut_db_sql(create_db)
        self.log.info(create_db_res)
        self.assertIn(self.constant.CREATE_DATABASE_SUCCESS, create_db_res,
                      f"执行失败:{text1}")

        text2 = '-----step2:开启事务a，重命名数据库，不提交，' \
                '事务b执行后提交;expect:执行成功，获取锁-----'
        self.log.info(text2)
        sql1 = f"start transaction;" \
               f"alter database {self.db_name} " \
               f"rename to new_{self.db_name};" \
               f"select pg_sleep(3);" \
               f"end;"
        session1 = ComThread(self.pri_sh.execut_db_sql, args=(sql1,))
        session1.setDaemon(True)
        session1.start()
        time.sleep(1)

        text3 = '-----step3:开启事务b，修改数据库所属表空间;' \
                'expect:等锁释放，事务a提交(解锁)，事务b执行失败-----'
        self.log.info(text3)
        sql2 = f"begin;" \
               f"select * from pg_locks;" \
               f"alter database {self.db_name} set tablespace pg_default;"
        session2 = ComThread(self.pri_sh.execut_db_sql, args=(sql2,))
        session2.setDaemon(True)
        session2.start()
        session1.join(10)
        session2.join(10)
        result1 = session1.get_result()
        self.log.info(f'session1_results: {result1}')
        result2 = session2.get_result()
        self.log.info(f'session2_results: {result2}')
        self.assertIn(self.constant.START_TRANSACTION_SUCCESS_MSG,
                      result1, f"执行失败:{text2}")
        self.assertIn(self.constant.ALTER_DATABASE_SUCCESS_MSG, result1,
                      f"删除表失败:{text2}")
        self.assertIn(self.constant.COMMIT_SUCCESS_MSG, result1,
                      f"提交事务失败: {text2}")
        self.assertIn(f'ERROR:  database "{self.db_name}" does not exist',
                      result2, f"执行失败{text3}")

    def tearDown(self):
        text4 = '-----step4:清理环境 expect:成功-----'
        self.log.info(text4)
        drop_db_res = self.pri_sh.execut_db_sql(
            f"drop database if exists {self.db_name};"
            f"drop database if exists new_{self.db_name};")
        self.log.info(drop_db_res)
        self.assertIn(self.constant.DROP_DATABASE_SUCCESS,
                      drop_db_res, f"删表失败:{text4}")
        self.log.info(f'-----{os.path.basename(__file__)} end-----')
